TL;DR:

  • Installing an air source heat pump in a leasehold flat requires freeholder consent — not just permitted development rights — because the external unit goes on shared property
  • The Boiler Upgrade Scheme (£7,500 grant) is technically available to leaseholders, but only with freeholder sign-off, which many management companies are reluctant to give
  • Alternatives worth exploring: communal heat networks, air-to-air heat pumps for some flats, and the growing number of blocks where the freeholder installs a shared ASHP system
  • The situation is improving: the Future Homes Standard means new-build leasehold flats from 2026 onward should come with heat pump infrastructure already in place

About 5 million households in England alone live in leasehold flats. Most of them heat their homes with gas boilers or expensive direct electric. As energy prices stay stubbornly elevated and the gas boiler phase-out approaches, heat pump interest among flat-dwellers has grown substantially — only to run into the peculiar complications of leasehold tenure.

This guide explains what’s actually achievable in 2026, without minimising the genuine obstacles or overselling solutions that don’t work for most people.

Why Leasehold Complicates Heat Pumps

An air source heat pump needs an outdoor unit — a box roughly the size of a large suitcase that sits outside the building, takes in air, and transfers heat to refrigerant. In a house, this goes on your own land. In a leasehold flat, the outside walls, roof, garden, and any shared external space belong to the freeholder.

This creates two separate permissions requirements that both need to be satisfied:

Permitted development rights (planning permission) — In England, a single ASHP per property can be installed under permitted development if it meets certain conditions: the unit is at least one metre from a property boundary, it’s not on a wall or roof that fronts a highway, the site isn’t a listed building, and noise output meets MCS 020 guidance. For flats in a block, the wall conditions are the key sticking point — the external wall almost always faces something shared or public.

Freeholder consent — Even if planning permission isn’t required, installing anything on shared external fabric requires your freeholder’s permission under the terms of your lease. Most leases have a clause requiring consent for alterations, especially to shared structure. The freeholder (or their management company) can refuse, and there’s limited recourse if they do — the Leasehold Reform (Ground Rent) Act 2022 and subsequent reforms don’t compel freeholders to allow heat pump installations.

In practice, most leaseholders in older blocks of flats cannot install an individual ASHP. Some can if their flat is at ground level with a private garden or the freeholder is cooperative. The picture varies enormously.

When It Is Possible

A minority of leasehold situations are genuinely workable:

Ground floor flat with private garden or patio: If your lease demises a private outdoor space to you (check the lease — not all ground-floor flats have this), and the outdoor area doesn’t touch shared property or a public frontage, you may be able to install an ASHP without putting anything on shared structure. This still requires freeholder consent under most leases, but it’s a less contentious request.

Cooperative freeholder or management company: Some freeholders — particularly resident-owned freehold companies (where the leaseholders jointly own the freehold) — will consent. If you’re a shareholder in a residents management company, you may have influence over the decision. Worth raising at an AGM.

Block-wide retrofit organised by the freeholder: A growing number of freeholders are arranging whole-block ASHP or heat pump installation as a major works project under Section 20 of the Landlord and Tenant Act 1985. Each leaseholder gets a communal heat pump feed rather than individual units. This sidesteps the individual consent problem entirely — the freeholder installs infrastructure on property they own, and leaseholders connect to it. The cost may be passed to leaseholders through service charge, which has its own complications.

The Boiler Upgrade Scheme for Leaseholders

The BUS grant (£7,500 for an ASHP as of 2026) is available to leaseholders in principle. In practice:

  • The application requires a valid MCS-certified installation, which requires a surveyed heat loss calculation for the property
  • The installer (or the leaseholder) must confirm they have all necessary permissions, including freeholder consent
  • Many MCS installers won’t survey or quote for a leasehold flat without written freeholder consent in hand, because they’ve learned from experience that deals fall through

If you have freeholder consent, the BUS application process is the same as for a house. Without it, the grant is inaccessible. Some leaseholders have found success by approaching their freeholder with the BUS application details — a £7,500 subsidy changes the economics considerably and may move a sceptical freeholder to agree.

Alternatives for Flat-Dwellers

Heat networks (district heating)

If your flat or your area has access to a heat network, this is often the practical path to low-carbon heat without needing individual consent. A heat network delivers hot water from a central plant (which may use large-scale heat pumps, combined heat and power, or geothermal) to individual dwellings via insulated pipes. You get heat through a heat interface unit (HIU) inside your flat — roughly the size of a small boiler. No outdoor unit, no freeholder consent issues beyond what any major block improvement would require.

Heat networks are regulated under the Heat Network (Consumer Protection) Act 2023, which introduced minimum service standards and tariff transparency requirements. Check with your local council whether your area is in a heat network zone — local authorities are mapping heat network opportunity areas as part of the Heat Networks Delivery Unit process.

Air-to-air heat pumps

Air-to-air systems (essentially efficient inverter air conditioners that run in both heating and cooling modes) have a fundamentally different installation profile from air-to-water ASHPs. The outdoor unit is smaller, the refrigerant pipework is narrower, and some models can be installed through a wall rather than requiring a large external unit on a slab.

The permissions situation is similar — you still need freeholder consent — but smaller units are sometimes easier to get approved. The core limitation is that air-to-air systems don’t heat your hot water; you’d still need a separate hot water solution.

For flats with high cooling loads (south-facing, top floor), an air-to-air unit can deliver significant energy savings compared to electric heaters, even before counting the heat pump efficiency benefit.

High-efficiency electric heating

If heat pumps are genuinely off the table, modern electric radiators with individual thermostatic control and smart scheduling are considerably more efficient than older storage heaters. They don’t achieve heat pump efficiency ratios, but combined with a smart tariff (Octopus Intelligent, for example) that charges at lower overnight rates, the running cost gap narrows.

For flats on standard variable tariffs, electric heating is expensive. For those on time-of-use tariffs with significant overnight charging capacity (or who have solar panels in a block arrangement), the maths can work.

Solar panels on the roof

If your block’s freeholder is amenable to improvements, a rooftop solar installation with the output credited to leaseholders is achievable — and several resident-run freehold companies have done exactly this. The electricity can run heat pumps, air-to-air systems, or simply offset electric heating costs. This requires coordinated action, usually at residents association or shareholders meeting level.

What’s Changing

The Future Homes Standard, which applies to new-build homes from 2025 onward, means new leasehold flats should come with low-carbon heating infrastructure already in place — typically ASHP-based communal systems or high-efficiency heat pump heating built into the structure. For buyers of new-build leasehold flats from 2026 onward, the question of installing a heat pump largely disappears: it should already be there.

The Leasehold and Freehold Reform Act 2024 made some changes to how service charges are managed but didn’t directly address heat pump installation rights. There’s ongoing discussion about whether permitted development for individual heat pumps should automatically extend to leasehold properties in cases where the freeholder cannot demonstrate genuine harm from consent — but nothing has been legislated yet.

For existing leaseholders in older blocks, the most productive approach is often to organise collectively: raise heat pump options at your residents association, consult with your management company about block-wide options, and — where relevant — explore whether your area qualifies for local authority retrofit support that covers blocks of flats.

Practical Checklist Before You Call an Installer

  1. Read your lease — specifically the alterations clause. Some leases are more permissive than others. Your solicitor can interpret ambiguous wording.
  2. Identify your freeholder — it may be a company you don’t recognise. The Land Registry title register shows who owns the freehold.
  3. Check if your block is a resident-owned freehold — if the residents control the freehold, organising consent is an internal decision.
  4. Contact your management company in writing — ask what their policy is on heat pump installation and what evidence they need to consider consent.
  5. Get a survey quote contingent on consent — some MCS installers will visit and quote with a note that installation is subject to permissions, so you have cost and design information to present to the freeholder.
  6. Check local heat network plans — your council’s local area energy plan may show upcoming heat network zones.

References